(1R,5R,6S)-3-(tert-Butyl-diphenyl-silanyloxymethyl)-1-hydroxy-5-methoxymethoxy-6-vinyloxymethyl-cyclohex-3-enecarboxylic acid ethyl ester

(1aS,2R,3aS,5R,7aR,7bR)-5-Bromomethyl-hexahydro-1,4,6-trioxa-cyclopropa[a]naphthalene-2,3a-dicarboxylic acid 2-tert-butyl ester 3a-ethyl ester